OP, I might the rolling eyes from some but why not get both? Keep the Z and get a GTR. The Z being the fun, engaging car with low upkeep for normal errands; the GTR being the exotic monster for special outings. That's the route I'm engaging on; the curves, lines, price to value ratio and performance of the Z make it hard for me to ever let it go and replace it so I will add to the collection.
Congrats DJ, I hope to join you in a few years with the GTR experience. Enjoy the beast